/Engine/Source/Runtime/CoreUObject/Public/UObject/PackageTrailer.h
Try to load a trailer from a given archive. Assumes that the trailer is at the end of the archive
static bool TryLoadFromArchive ( [FArchive](API\Runtime\Core\Serialization\FArchive) & Ar, [FPackageTrailer](API\Runtime\CoreUObject\UObject\FPackageTrailer) & OutTrailer )